SACRAMENTO — An email from a federal agency cybersecurity official says California’s online health insurance marketplace had a lingering security concern in its computer system more than three months after it opened.

The security flaw was noted in a Jan. 10 email between officials with the federal Centers for Medicare and Medicaid Services. The agency references a “vulnerability” on the California exchange that had not been fixed.

It also said a reference to the flaw had been posted publicly.

The agency said it contacted the state marketplace quickly and learned that it was already addressing the issue. There is no indication that any consumer information was compromised.

California insurance exchange spokesman Dana Howard denied the system ever had a vulnerability and said no consumer information was ever breached.